Cross current cylinder type papermaking machine



" y 3- V L. HORNB OSTEL 2,319,133

- CROSS CURRENT CYLINDER 'IYYE PAPER MAKING MACHINE Filed 301;. 19, 1939 5 Sheets-Sheet 1 LLbvb lf/pmvaosra May 11, 1943- I L..HORNBOSTEL.

C3055 CURRENT CYLINDER TYPE PAPER MAKING MACHINE Filed Oct. 19, 19:59 5 Sheets-Sheet 2 L LO YD HORNBOS TEL H May 11, 1943; L. H ORNBOSTEL 2,319,133

CROSS CURRENT CYLINDER'TYPE PAIER IIAKING EACHINE Filed Oct. 19', 1939 5 Sheets-Sheet s LLOYD HO/M/BOJTEL ZHZYEIIZUP:

May 11 1943.-' 1.. .HORNB OSTEL 2,319,133

. CROSS, CURRENT CYIJINDER TYPE PAPER MAKING MACHINE I Filed on, 19, 1939 s-sneets-sneet 4 Lwm Hbmvaasra May 11,1943. Q N T- 2,319,133

cnoss CURRENT CYLINDER TYPE- PAPER MAKING MACHINE Fild Oct. ie, 1959 'S'SheetS-Sheet 5 22 as r Znrzen Ur [.Lo V0 HORNBOS TEL I Patented May 11, 1943 entree stares ear onoss onnnn'r consin Application October 19, 1939, Serial No. 300,118

(El. 9M3) 6 Claims.

This invention relates to a cylinder type paper making machine equipped with devices for creating cross currents of paper stock in the stock vats alongside of the cylinder molds.

More particularly, the invention relates to the incorporation on a cylinder vat of a cross circulation pump receiving paper stock out of one side of the vat and forcing this paper stock into the other side of the vat to cause a cross flow of tear strength. The ratio of tear strength across the sheet and tear strength longitudinally of the sheet is always quite high in cylinder formed sheets or boards. This invention, however, now makes possible the production of paper sheets or boards on a conventional type cylinder machine having a. tear strength in the longitudinal direction that is substantially the same as the tear strength in the transverse direction. As a result sheets can be prepared, according to this invention, having a tear ration of one, or even less than one, since it is possible to obtain a crossing of fibers to such extent that a majority of the fibers will lie in a direction transversely of the sheet. The invention thus makes possible a control of fiber formation in cylinder formed paper sheets or boards that was not heretofore obtainable.

The cross current circulating devices of this invention are readily adapted for incorporation (in a conventional cylinder type paper making machine, and'an important ieature of the invention is that it is possible to change the machine equipped with the cross current circulating devices from a cross current machine to a conventional type machine by simply shutting down the cross current circulating devices. These cylinder machines can, therefore, be started in the conventional manner to obtain a sheet formation on the cylinders. The consistency of the stock, speed of the machine and the like ope timum operating conditions can be reached before the cross current devices are started up. An adjustment of the cross current devices will then make possible an exact regulation of whatever cross current effect is desired in the sheet without in any way afiecting flow of stock through the vet from the mixing boxes, screens and the like. While cross current vats have heretofore I been proposed for cylinder type paper making machines, these vats all require the initial cross current circulation of stock through the vat. Thepresent invention, however, deals with the creation of a cross current efiect on stock already introduced into the vat in a conventional manner.

in one embodiment of the invention, a small cross circulation pump is added to a conventional cylinder vat receiving stock in one end thereof from the usual head box. The pump receives stock already introduced into the vat by the feed box and circulates this stock out of one side of the val: and introduces the stock in at the other side of the vat alongside of the cylinder mold at a point where the open cylinder first goes into the stock and thus at the point where most at the sheet formation mkes place.

In another modification of the invention, the cross current circulating pump is used to produce cmss currents both at the ascending and dc.- ecendina sides of the cylinder, or at either side separately. This pump receives stock from the vat circle at one side of the rat and ejects this stock back to the vat circle at the other side of the vat on both the ascending and descending sides of the cylinder, or on either sideseparately.

Another important feature of the invention is that, on a multl-vat cylinder type paper-making machine, it is possible to create oppositely flowin; cross currents in adjacent, vats so that the fibers on one cylinder mold cross in one direction, while the fibers on the next cylinder mold cross in the other direction. In this manner the alternate layers of a multi-ply sheet or board have opposite crossing of fibers and the resulting-sheet or board is materially stronger than a conventional cylinder formed sheet or board.

It is then an object of this invention to provide a cylinder type paper making; machine wherein'a cross current: circulation of stock'in the vat pond or ponds is produced alongside of the web forming cylinder or cylinders.

A further object of the invention-is to provid a cross current circulating device for a conventional cylinder vat to improve the fiber formation of a cylinder formed sheet.

Another object of the invention is to provide a cross current circulating device for a cylinder vat wherein the stock in the vat circle ls-caused to flow along the length of the web forming cylinder rotatable in the vat circle.

A specific object of the invention is to provide a small cross circulation pump and piping arrangement for inducing a cross current of stock in the stock pond of a cylinder vat.

Another specific object of the invention is to take stock out of one side of a cylinder vat and put it in the other side of the vat so as to establish a cross current of stock in the vat at a point where the open web forming cylinder first enters the stock. I

Another object of the invention is to take stock out of a stock vat atthe ascending and descending sides of the web forming cylinder rotatable in the vat and eject this stock at the other side of the vat to establish a cross flow along both sides of the cylinder.

Other and further objects of the invention will become apparent to those skilled in the art from the following detailed description of the annexed sheets of drawings which disclose preferred embodiments of the invention.

On the drawings:

Figure 1 is a side elevational view of the wet end of a cylinder type paper making machine equipped with cross current stock circulating devices according to this invention;

Figure 2 is a top plan view of the machine shown in Figure 1 with the pick-up felt omitted;

Figure 3 is an enlarged fragmentary vertical cross sectional view taken along the line III-III of Figure 2;

Figure 4 is a vertical cross sectional view taken along the line IV-IV of Figure 3;

Figure 5 is a vertical cross sectional view, with parts in elevation, taken along the line V-V of Figure 3;.

Figure 6 is a vertical cross sectional view, with parts ,pmitted and with parts shown in elevation, taken along the line'VI-VI of Figure 3;

Figure '7 is a vertical cross sectional view, with parts in elevation, taken along the line VII-VII of Figure 3;

Figure 8 is an end elevational view, with parts in vertical cross section, of a modified form of cross current cylinder type paper making machine according to this invention; and

Figure 9 is a top plan view of the machine shown in Figure 8.

As shown on the drawings:

In Figures 1 to 3 inclusive, the reference numerals IO; N, and |2 designate generally the vats of a cylinder type paper making machine. Each vat III, II, and I2 has the usual screen faced cylinder mold l3 rotatably mounted in the vat circle ll thereof. A pick-up felt I5 is directed over the tops of the cylinder molds l3 to pick up the wet fibrous webs formed on the screen surfaces of the cylinder. Couch rolls I6 direct the pick-up felt |5 against the cylinders i3, so that the pick-up felt will couch off the webs from the cylinders.

As best shown in Figures 3 and 4, each stock of the compartment 23 is defined by inclined .converging boards or members 2 spaced above the bottom ll of the vat and defining hopperlike bottoms for the compartment.

Stock inlet pipes 25 communicate with manifold pipes 26 which extend through the bottom ll of the vat into communication with the hopper-like portions of the compartment 23 defined by the boards 24, as shown in Figure 4. Stock is forced upwardly through the compartment 23, around a horizontal baiiie 21 over the top of the baille 22, under a second vertical baiiie 23 extending from the top of the vat into spaced relation from the bottom of the vat, and thence upwardly over the top of the vat circle wall or making board 29 into the vat circle i4.

Thus each cylinder vat l0, II, and I2 is provided with a feed box for supplying stock to the vat circle of the vat. A pond of stock is maintained in each vat circle, and the cylinder molds i3 rotate through this pond.

Clean-out doors 30 closing openings in the side walls 20 and 2| of the vat provide means for cleaning the feed boxes.

White water drain conduits 3| are secured to the front and rear side walls 20 and 2| of each vat ,and communicate through openings 32 (Figure 5) in the side walls of the vat with the lower portions of the interior of the cylinder molds l3. As is customary in cylinder vats, the ends of the molds |3 are. sealed from the stock iausmd in the vat circle i4 by means of end seals In the form illustrated, the white water drain conduits 3| are castings which also carry bearing supports 34 for the axles 35 of the cylinder molds i3. Thesecastings 3| can have openings in the bottoms thereof closed by clean-out doors 36 permitting access to the interiors of the castings for cleaning the same.

As best shown in Figure 3, the wall member 29 in the stock vat defining the vat circle I provides passageways 31 and 38 across the bottom of the vat in sealed relation from the stock in the vat circle and in the feed box. The passageway 31 communicates through openings in the side walls 20 and 2| of the vat with the bottom of the castings or white water conduits 3|. White water thus flows from the interior of the cylinder mold i3 through the conduits 3| and into the passageway 31, as best shown in Figure 5. A white water drain pipe 39 extends through the bottom I1 of the vat and receives the white water from the passageway 31.

Each of the stock vats IO, U, and i2 therefore receives stock into their vat circles 4 from feed boxes formed in the front ends of the vats. White water from the stock in the vat circles is filtered through the screen surfaces of the cylinder molds and drained from the interiors of the cylinders through the conduits 3i and passageways 31 into the drain pipes 39.

In order to control the white water and foam level inside of the cylinders l3, the drainage of white water through the conduits 3| is regulated so as to maintain a desired head of white water in each cylinder. The white water and foam level is prevented from exceeding the desired level by means of overflow devices communicating with the interiors of the cylinders at levels above the openings 32 into white water drain conduits 3|.

Thus, as best shown in Figures 1, 2, 4, 6, and 7, overflow conduits in the form of castings 40 are secured to the side walls 20 and 2| of each vat IO, N, and 2 on the outside of the vat and extend vertically in front of the castings 8i. These castings 40 have open tops extending to the tops of the side walls. The side walls have elongated openings 4| therein Joining the interiors of the castings 40 with the ends or the cylinders It. The openings 4| extend from a point below the axis of the cylinders 18 to a point adjacent the top of the vat, as best shown in Figure 6.

Each casting Ell-has a wall member 42 therein at a level adjacent the bottom of the opening it. An open ended cylinder 53 extends through the wall 62 and is in tight fitting engagement with this wall. e

A second open ended cylinder tt-is vertically slidable within each cylinder 43 and is carried by a threaded rod 65 depending from a bracket it secured at ,the top of the casting 80. A handwheel 51 is in threaded. engagement with the rod 55, and rotation of this wheel raises and lowers the rod to operate the cylinder 4%. White.

water from the cylinders will thus also fiow through the openings dl into the top portions of the castings M above the wall members it, and a when the level of this water rises above the tops of the adjusted positions of the cylinders it, the water will drain through the cylinders M and 33 into compartments lfla of the castings 88 beneath the wall members 432. These compartments dim communicate through openings it in the side walls 28 and 2! of the vat with the passageways 38 beneath the vat circle wall members 2Q, as defined above in connection with Figure 3.

A drain pipe at communicates with each passageway 38 through the bottom ll of the cylinder vat, and the overflow of foam and white water from the overflow conduits lll is drained out of each vat through this pipe.

Clean-out doors at can be provided in the bottoms of the conduits all for cleaning out the compartments 60a in the conduits.

Therefore, while the white water from the lower portions of the cylinders is drained out of the ends of the cylinders through the conduits or castings 3!, the white water and foam is drained out at the upper portion of the cylinders through the conduits or castings it, and the desired level of white water in the cylinders'is maintained by a setting of the overflow devices M.

As best shown in Figures 3 and '7 an additional set of openings 52 are cut through the front and I rear side walls 29 and 2i of each stock vat into communication with the pond areas in the vat circles i l of the vats. These openings 52 are thus exterior of the cylinders l3 and extend vertically along the descending sides of the cylinders. They are thus located at points in the stock pond where the cylinder first enters the pond and where most of the fiber formation occurs on the cylinder.

As best shown in"Figures l, 2, and 7, vertical conduits 53, in the form of castings, are secured on the outer faces of the vat side walls 28 andZi in registration with the openings 52. These castings extend downwardly along the sides of each vat near the front end wall it of the vat and communicate at their bottom ends with a pipe 54 (Figure 7) extending through the passageway 38 provided in each stock vat. The pipe 56 is sealed from communication with white water flowing through the passageway 38 and only receives stock from a conduit 53.

Stock is propelled through the pipe 56 by means of a propeller blade 55 mounted in the mouth of the pipe 56 and carried on a drive shaft 56 extending from a variable speed motor 51 which is bolted on the adjacent casting $3.

Stock in the vat circle II is thus caused to flow through the pipe GI and is discharged back '5 into the pond at the other side of the vat. A

cross current of stock is thus obtained right at the point where the cylinder mold enters the 1 pond. The fibers in the stock will'assume the direction of fiow induced by the circulating propeller 55 and will lie mainly parallel with the axis of the cylinder molds. Then, as these fibers are deposited on the revolving mold, their tail ends may-be pulled around by the revolving cylinder so that the fibers will assume an angle to the direction of travel of the machine instead of lying mainly in the machine direction. Since the motor 5? can be varied to vary the speed of the propeller 55, the cross current effect can be varied at will, and any desired fiber formation can be obtained in the sheets.

' A valve or damper 58 can be mounted in either or both of the conduits 53 to further control the degree of cross circulation.

A clean-out door 58 can be provided in the terior of the conduit and the pipe 5d I As best shown in Figures 2 and 3, the motors and propellers fill and 55 are alternately mounted on the back and front sides of the succeeding vats Id, H, and i2, so that the cross currents in adjoining vats will be flowing in opposite directions. This permits an excellent fiber formation in a multi-ply sheet or board, since the directions of the fibers in adjacent plies will be opposite.

It should be understood, however, that the cross currents in. all of the vats can be in the same direction. It should also be understood that the propellers and their driving motors can be replaced with any other pumps and prime movers of known construction.

In the modification shown in'Figures 8 and '9,

parts substantially identical with parts described I in Figures 1 to 'linclusive have been designated by the same reference numerals.- In Figures 8 and 9, the vat ii is mounted on concrete flooring it defining a pit M beneath the vat. The concrete flooring 60 is carried on pedestals $2.

"openings therethrough communicating with the stock pond in the vat circle it on both the ascending and descendin sides of the cylinder molds it. These openings receive conduits or ducts E3. The ducts 63 in the front side wall 2% are joined to a Y-pipe St. The Y-pipe Si, in turn, is joined to a vertical pipe$5 extending through the floor at and connected through a horizontal pipe line 66 with the discharge side of a pump t'l mounted beneath the pit at. The pump 67 is driven through a belttt by a variable speed electric motor I59. The conduits 63 on the back side wall 25 of the vat ii are connected to a Y-pipe 10 which communicates with a vertical pipe H extending through the floor so under the pit 6!. The pipe ii is coupled to a horizontal pipe I2 entering the inlet side of the pump 6!.

Stock from the stock pond in the vat circle conduit 53 that does not receive the motor Bl The side walls 2d and 25 of the vat ll have 4 as well as where it leaves the stock pond. In this modification, therefore, stock already in the vat circle is caused to fiow alongside of the cylinder mold on both sides of the mold. In the illustrated modification, the stock flows in the same direction on both sides of the cylinder, but by obvious re-arrangement of the piping the stock'on one side of the cylinder could be caused to flow in an opposite direction to the stock on the other side of the cylinder, if desired.

From the above descriptions, it shouldv be understood that this invention now provides for the cross circulation of stock in a cylinder vat at points where the major web formation occurs on the cylinder mold. The cross current circulating devices of this any conventional cylinder type paper making machine and make improved flber formation in cylinder sheets at very low cost.

It will, of course, be understood that various details of construction may be varied through a wide range without departing from the principles of this invention and it is, therefore, not the purpose to limit the patent granted hereon otherwise than necessitated by the scope of the appended claims. a

I claim as my invention;

1. A cylinder type paper making machine com-. prising a vat, a curved wall in said vat defining a vat circle for a pond of stock, a feed box and making board for supplying stock to one end of the vat circle, a cylinder mold rotatably mounted in said vat circle to ascend at the feed box .end thereof, means for draining white water from the interior of the cylinder mold, stock circulating ducts communicating with the other end of vat circle through the front and rear side walls of the vat, a pipe line connecting said ducts, and a stock circulating device in said pipe line for inducing a cross flow of stock in said other end of the vat circle remote from the feed box end and invention are readily applicable to municating with the same remote end of the vat at the other side thereof and near the top of the vat to feed stock to the vat, an impeller for circulating stock through the conduits to induce a cross flow of stock-across the vat alongside the descending side of said cylinder mold in substantially parallel relation with the cylinder mold, and means for regulating said circulation to control the degree of cross flow;

4. A stock vat for a cylinder type paper making machine comprising an open top box, a curved of the vat circle possible the production of adjacent the descending side of the cylinder mold.

2. In a cylinder type paper making machine, a stock vat, a curved wall member in said vat defining a vat circle for a pond of stock, a feed box in one end of said vat for supplying stock to the vat circle over the top of said curved wall member, a cylinder rotatably mounted in said vat in spaced relation from said curved wall member, said curved of the vat a pair of white water passageways at the bottom of the vat, conduits mounted on the side walls of the vat communicating with the interior of the cylinder and with one of said white water passageways, additional conduits mounted on the side walls of the vat communicating with the cylinder at a-level above said first mentioned conduit and discharging into said second white water passageway, and overflow devices in said additional conduits to control the level of white water in the cylinder.

3. In a cylinder type paper making machine including a stock vat with a feed box and making board at one end thereof and having a cylinder mold rotatably mounted in the vat to ascend at the feed box end of the vat, the improvements which comprise a conduit communicating with the upper interior portion of the vat at the end thereof remote from the feed box end for receiving paper stock therefrom, a secondconduit com wall member defining with the walls,

wall member in said box defining a vat circle for a pond of stock, a feed box and makin board for supplying stock to one end of said vat circle, a

pair of conduits mounted on the front side wall of the vat communicating with the top ends only on both the ascending and descending sides of the cylinder, a second pair of conduits mounted on the rear side wall of said vat communicating with the top ends only of said vat circle on both the ascending and descending sides of the cylinder, a pipe joining the conduits on the front side wall, a second pipe joining the conduits on the rear side wall, a pipe line connecting said joining pipes, and a pump in said pipe line for circulating stock out of one side of said vat circle back into the other side of the vat circle to create cross currents in stock previously introduced into the vat 5. In a multi-cylinder type Paper making machine including a plurality of stock vats, a feed box and making board at one end of, each vat for feeding paper stock to said vats to maintain ponds of stock therein, a cylinder mold rotatable in each pond to ascend at the feed box end of each vat, and means 'for draining white water from the interior of each mold to deposit fibers from said ponds on the peripheries of the molds, the improvements which comprise drain conduits on opposite sides of succeeding vats communicating with the stock ponds therein at points where the molds enter the ponds and remote from the feed box ends of the vats, an inlet conduit for each vat communicating with the pond ofstock therein at a side of the vat opposite to the side receiving the drain conduit and at a point-where the mold therein enters the pond remote from the feed box end of the vat, and means for circulating stock out of and back to each pond through the drain and inlet conduits for creating cross currents of stock flowing in opposite directions in succeeding vats across the widths of the vats and in substantially parallel relation to the molds in the vats.

6. The method of making paper-which comprises feeding stock to one end of a pond across LLOYD HORNBOSTEL.

circle from said feed box. 

